Main Page | See live article | Alphabetical index See also: 1685 in science, other events of 1686, 1687 in science and the list of years in science. Table of contents 1 Astronomy 2 Geology 3 Meteorology 4 Physics 5 Births 6 Deaths Astronomy Gottfried Kirch notices that Chi Cygni's brightness varies. Geology Edmund Halley establishes the relationship between barometric pressure and height above sea level. Meteorology Edmund Halley presents a systematic study of the trade winds and monsoons and identifies solar heating as the cause of atmospheric motions. Physics Isaac Newton uses a fixed length pendulum with weights of varying composition to test the weak equivalence principle to 1 part in 1000 Births May 24 - Gabriel Fahrenheit, physicist, inventor (+ 1736) Deaths Nicolas Steno: pioneer in early-modern geology This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.